[MM-44488] Cloud limits: enforcing messages (#20362)

* Add new Job to keep updating the last_accessible_post time

* Filter out posts for funcs returning PostList model

* Separate methods to get and compute cache

* filter pinned posts

* For posts with sorted CreateAt order, support a faster form of filtering.

* Add inaccessible header for getPost and getPostsByIDs APIs

* replace manual binary search with the std. library

* in-place filter posts

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>
Co-authored-by: Nathaniel Allred <neallred@protonmail.com>

store/retrylayer/retrylayer.go

@@ -6428,6 +6428,27 @@ func (s *RetryLayerPostStore) GetMaxPostSize() int {
 
 }
 
+func (s *RetryLayerPostStore) GetNthRecentPostTime(n int64) (int64, error) {
+
+	tries := 0
+	for {
+		result, err := s.PostStore.GetNthRecentPostTime(n)
+		if err == nil {
+			return result, nil
+		}
+		if !isRepeatableError(err) {
+			return result, err
+		}
+		tries++
+		if tries >= 3 {
+			err = errors.Wrap(err, "giving up after 3 consecutive repeatable transaction failures")
+			return result, err
+		}
+		timepkg.Sleep(100 * timepkg.Millisecond)
+	}
+
+}
+
 func (s *RetryLayerPostStore) GetOldest() (*model.Post, error) {
 
 	tries := 0